Definitions for antediluvian

very old, old-fashioned, or out of date; antiquated; primitive: antediluvian ideas.

of or belonging to the period before the Flood. Gen. 7, 8.

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Citations for antediluvian

The other thing that almost always goes with these myths is the notion of an antediluvian civilisation -- something which existed before the flood and was destroyed by it.Graham Hancock, The Guardian

The far thornier task of safeguarding the city's skyline and its neighborhoods falls to the Planning Commission. It should revise the antediluvian zoning code to prohibit any developer from exploiting air rights, plaza bonuses and other zoning tools to create a structure that does not fit the scale of a neighborhood…, The Scale of Mr. Trump’s Dreams,” New York Times, January 9, 1999